CROUZET motor Germany CROUZET model CROUZET price

CROUZET motors refer to motors with speeds exceeding 10000r/min. Due to their high speed, their volume is far smaller than that of ordinary motors of the same power. Connected directly to the prime mover, they eliminate traditional reduction gears. Reasons such as low rotational inertia of high-speed motors result in advantages including high power density, effective material savings, high transmission efficiency, low noise, and fast dynamic response.

CROUZET motor structure

The motor mainly consists of a stator, rotor, and bearings. The stator is mainly composed of an iron core, three-phase windings, frame, and end shields. The stator core is generally punched and stacked from silicon steel sheets with an insulating layer on the surface, with a thickness of 0.35~0.5 mm. Slots are uniformly distributed on the inner circle of the core to accommodate the stator windings. The three-phase windings are formed by connecting three structurally identical windings arranged symmetrically with a spatial separation of 120° electrical degrees. The coils of these windings are embedded in the stator slots according to specific rules. Their function is to generate a rotating magnetic field when supplied with three-phase AC current. The frame is typically cast iron; for large asynchronous motors, it is generally welded from steel plates, while for miniature motors, it is made of cast aluminum. Its function is to fix the stator core and front/rear end shields to support the rotor, providing protection and heat dissipation. Closed motors have cooling fins on the outside of the frame to increase the heat dissipation area. Protected motors have ventilation holes in the end shields at both ends of the frame, allowing direct convection of air inside and outside the motor to facilitate heat dissipation. The end shields mainly serve to fix the rotor, provide support, and offer protection. The rotor mainly consists of an iron core and windings. The material used for the rotor core is the same as that of the stator, punched and stacked from silicon steel sheets 0.5 mm thick. Holes are uniformly distributed on the outer circle of the silicon steel sheets to accommodate the rotor windings. Typically, the inner circle of the silicon steel sheets remaining after punching the stator core is used to punch the rotor core. For small asynchronous motors, the rotor core is directly press-fitted onto the shaft. For large and medium-sized asynchronous motors (with rotor diameters above 300~400 mm), the rotor core is pressed onto the shaft using a rotor spider. Rotor windings are divided into squirrel-cage rotors and wound rotors. (1) Squirrel-cage rotor: The rotor winding consists of multiple conductive bars inserted into the rotor slots and two ring-shaped end rings. If the rotor core is removed, the overall shape of the winding resembles a squirrel cage, hence the name cage winding. Small cage motors use cast aluminum rotor windings, while motors above 100KW use copper bars and copper end rings welded together. Squirrel-cage rotors are classified into impedance type, single squirrel-cage type, double squirrel-cage type, and deep-bar type, each with different characteristics such as starting torque. (2) Wound rotor: The wound rotor winding is similar to the stator winding, also a symmetrical three-phase winding, generally connected in star configuration. The three output terminals are connected to three slip rings on the shaft, which then connect to the external circuit via brushes.

CROUZET motor structure

The electronic commutation circuit of the motor consists of two main parts: the power conversion circuit and the control circuit. Working in conjunction with position sensors, it controls the energization sequence and timing of each phase winding of the motor stator, performing a function similar to mechanical commutation. During system operation, the power converter accepts control information from the control circuit, distributing the system's working power to the phase windings on the stator of the brushless DC motor according to a certain logical relationship, thereby enabling the motor to produce continuous torque. The inverter converts DC current into AC current to supply the motor. Unlike general inverters, its output frequency is not independently adjusted but is controlled by the rotor position signal, making it a "self-controlled inverter." Permanent magnet brushless motors BLDCM, due to the use of self-controlled inverters, maintain synchronization between the input current frequency and the motor speed. The motor and inverter do not experience oscillation or loss of synchronism, which is one of the significant advantages of permanent magnet brushless motors BLDCM. For electric vehicle motors, the energization sequence and timing of each winding primarily depend on signals from position sensors. However, the signals generated by the position sensor generally cannot directly drive the power switching elements of the power converter. They often require logical processing and isolation via the control circuit before driving the switching elements of the power converter. The driver box circuit processes the rotor position signals detected by the position sensor and outputs them according to a specific logic code to trigger the power switching transistors.

CROUZET motor working principle

A motor is an electric motor that converts DC electrical energy into mechanical energy. It is widely used in electric drives due to its good speed regulation performance. DC motors are classified into 3 types based on excitation method: permanent magnet, separately excited, and self-excited. Among these, self-excited motors are further divided into 3 types: shunt, series, and compound. When DC power supplies the armature winding through brushes, conductors under the N pole on the armature surface carry current in the same direction. According to the left-hand rule, these conductors are subjected to a counter-clockwise torque. Similarly, part of the conductors under the S pole on the armature surface also carry current in the same direction, and according to the left-hand rule, they are also subjected to a counter-clockwise torque. Thus, the entire armature winding, i.e., the rotor, rotates counter-clockwise, converting the input DC electrical energy into mechanical energy output on the rotor shaft. It consists of a stator and a rotor. Stator: base, main poles, commutating poles, brush assembly, etc. Rotor (armature): armature core, armature winding, commutator, shaft, fan, etc.

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